QComboBox {
    background-color: white;
    border: 1px solid #cccccc;
    border-radius: 4px;
    padding: 4px 8px;
    min-width: 80px;
}
QComboBox:hover {
    border-color: #999999;
}
QComboBox::drop-down {
    subcontrol-origin: padding;
    subcontrol-position: top right;
    width: 20px;
    border-left: 1px solid #cccccc;
}
QComboBox::down-arrow {
    image: url(:/icons/arrow_down.svg);
    width: 10px;
    height: 10px;
}
QComboBox QAbstractItemView {
    background-color: white;
    border: 1px solid #cccccc;
    selection-background-color: #e5f3ff;
    selection-color: #000000;
    outline: none;
}